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I used the Samsung Asp700 Portable Speakers with my Samsung Armani phone, they were thrown in by an independent retailer as part of a deal. I see that you can get them now online for about £5 but originally they were around £20 - £25. They are a bit older now.
So, the speakers are round, white with silver coloured middles and a black plastic cover over the top with 'Samsung' on it. They plug into the phone with a standard cable. My only criticism here is that due to the shape they are hard to carry and transport, they are not foldable or retractable. Newer speakers fold in or have a retractable cable or both. So these speakers are not the type you pop in your bag they are more for occasional transportation.
The sound quality is excellent, I had a lot of mp3 tracks on the phone taken from CDs I own, though you can put downloaded content onto there. It pumps out a decent sound, with good bass and no tinny qualities to the top end. For the every day user these speakers are ideal but obviously they are not going to be Bose quality or be used for TV / Movie viewing or parties etc.
All in all I would recommend picking these speakers up if you have one of the compatible Samsung models because at the price they really are good quality & value for money.